OS Grid Reference Display and Analysis

Enter a grid ref with letters and without spaces (e.g. SP1097, SP105975), up to a maximum of 8 figures.

The marker will always settle at an intersection in an OS grid spaced at metres. Grid references are shown below, with correspondingly coloured grid squares on the map.

Show 10m square (8 figure grid ref):

Show 100m square (6 figure grid ref):

Show 1km square (4 figure grid ref):

Show 10km square (2 figure grid ref):

Show WGS84 longitude and latitude:

Marker Controls

Credits This mapping tool is based on two libraries of Javascript code. Conversion between OS and other coordinate systems uses code written by Jonathan Stott. The original version of the code which interfaces with the Google maps API was written by Keith Balmer (as used on the Bedfordshire Natural History Society web site), and has been updated to use version 3 of the Google maps API by Peter Coxhead. All code is available under the GNU General Public License Version 2.Page maintained by Peter Coxhead. Content last updated 17 May 2018. Javascript version